Datasheet

INTERFACESEQUENCE
Power-On,Attach,andPlaybackSequence
D+/D–
2.5V(Typ)
0V
InternalReset
ReadyforSetup
SOF
ReadyforPlayback
BusReset
SetConfiguration
SOF SOF
BPZ
BusIdle
5V (Typ)
1 AudioData
st
2 AudioData
nd
V (Pin3)
BUS
SSPND
V L
OUT
V R
OUT
700 sm
DeviceSetup
1ms
T0055-02
Play,Stop,andDetachSequence
D+/D–
V L
OUT
V R
OUT
AudioDataAudioData Last AudioData
Detach
SOF SOF SOF SOF SOF
1ms
V (Pin3)
BUS
T0056-02
PCM2906B
SLES227–DECEMBER2008........................................................................................................................................................................................... www.ti.com
ThePCM2906BisreadyforsetupwhentheresetsequencehasfinishedandtheUSBdeviceisattached.Aftera
connectionhasbeenestablishedbysetup,thePCM2906BisreadytoacceptUSBaudiodata.Whilewaitingfor
theaudiodata(idlestate),theanalogoutputissettobipolarzero(BPZ).
Whenreceivingtheaudiodata,thePCM2906Bstoresthefirstaudiopacket,whichcontains1-msaudiodata,
intotheinternalstoragebuffer.ThePCM2906Bstartsplayingtheaudiodatawhendetectingthenext
start-of-frame(SOF)packet,asillustratedinFigure32.
Figure32.InitialSequence
Whenthehostfinishesorabortstheplayback,thePCM2906Bstopsplayingafterthelastaudiodatahave
played,asshowninFigure33.
Figure33.Play,Stop,andDetachSequence
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ProductFolderLink(s):PCM2906B
Not Recommended for New Designs